Introvert at extrovert school? (United World College school)?

This is a little socially awkward question for any self-respecting teenager to ask, but anyway, I hope someone can help:

I'm planning to apply for a United World College school soon, and while I think i have a reasonable chance of getting in, I'm not sure whether or not I should go if I do get in. One of the main reasons is because UWCs tend to be filled with happy, warm-hearted extroverts, and while I am usually happy and warm-hearted, I am definitely NOT an extrovert.

For those of you who don't know. UWCs are boarding schools, which have a huge emphasis on learning outside of the classroom, as well as engaging activities inside the classroom. Coupled with a rigorous workload on the IB, that is a heck load of bonding to do! Let me make it clear, I'm NOT an extrovert. If I went to a UWC, I would have to share a room with 3 other people, and I... like my privacy :-/

Plus, the UWC I'm considering is kind of a party / let's get drunk and have sex kind of school as well, even though that's against school policy.. but yeah, it has a wild party life. I am not a party person. Really.

Has anyone been through this at any time, i.e. gone to a boarding school and lived in a dorm / been surrounded by extroverts?

Thanks a lot guys :)